I have already done some work on these seats to firm them up, and now I need to find out how to make the seatback straight. Seems like the right side of the seatback is slightly farther back than the left. All the power adjustments work fine. Before I do experimental surgery, has anyone fixed this without replacing the seat?

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma